Ah, finally I have the
NEW INVENTORY page..
I see the notification there above my Inventory tab.

So I have observed the new Inventory page..
First, there is a FILTER button there, you might want to use the filter to choose which items that you want to see from your Inventory..
Then click on Show Items...
After that there is a "Sort By" options..
Ok, let's try..
I have choose some filters..

and then the sort by
ABC.. so here are the items that I want to see...

The items are not highlisted because I don't own them. Most of them are from the upcoming Special Events that I have posted yesterday..
Ok, let's try another filters..
Click on Show Items again and I choose sort by Attack, here they are my current Inventory :

And soon... and soon..
You can try this many times and decide how do you want to see your Inventory now.
One thing that we need to concern!
I have clicked on SUMMARY button on the screenshot below...
Was surprising me that it can give one random mafia Profile and I can see their Inventory!
Not good!
And just notice this, go to your Mafia Wars Profile and see at the bottom. Zynga made our Inventory to PUBLIC by deafult, now everyone can see our Inventory like the way we see it!
I believe that it's for players that have a New Inventory..

They must be crazy to make it like this!!!
Ok now all you have to do is click on "Change to private".

I just see that I have one email from a clan :
Everyone needs to go to their MW Profile page and go to the bottom and select make your inventory private. There is a new inventory GUI and Zynga choose to make your inventory public to everyone in the game as the default setting.
If you want to see your attackers or anyone's inventory that is public simply goto their MW page and goto the bottom and select look at their inventory!
Woot Zynga!!! Not a wise changing!!!
So please be informed about this, my friends... Quickly check your Mafia Wars Profile and if you see it as Public, change to Private!